Are you in one of the most chronically underpaid, high-paying jobs in America?

The average U.S. employee could be making $7,528, or 13.3%, more annually than their current annual base salary, according to salary monitor Glassdoor, which calculated the numbers based on their Know Your Worth salary estimator tool. In addition, three out of every five employees say they don’t negotiate their salary offer before taking a new job, setting workers up to leave money on the table unnecessarily, Glassdoor found.

Some jobs — like an emergency medical technician or nurse — could be missing out on as much as a 21% potential raise, according to the survey.

“Given that we’re in the best labor market we’ve seen in a generation, highlighted by healthy job growth, low unemployment and wages steadily growing, it’s not a surprise to see a gap between what most Americans are currently earning and what they could be earning,” Andrew Chamberlain, Glassdoor’s chief economist, said in a statement.

Robin Pinkley, Ph.D., a management professor at Southern Methodist University’s Cox School of Business and author of “Get Paid What You’re Worth,” told LearnVest about how not getting paid enough can make it harder for you to advance in your career.

“Potential employers use your current salary as a psychological cue to evaluate your value and skills relative to other candidates. It’s a well-proven marketing phenomenon called the brand effect,” Pinkley says.

In other words, if you didn’t make much in your last job, and you have to tell your next company your previous salary, odds are they’re going to match or increase it slightly — rather than give you a huge pay increase — making it hard for you to ever catch up to what you’re worth.

These are the high-paying jobs most likely to be underpaid:

Here are the top positions, pulled from Glassdoor’s list, where high-income workers could be negotiating bigger paychecks:

Pharmacist

Glassdoor’s data showed that while the “current median base salary” for this position is $118,000, the “current market value” is $141,261.

This means that pharmacists could actually be making 16.5% more, or $23,261 (called the “potential salary growth”).

Software Engineer

The current median base salary is $100,000, while the current market value is $117,943.

But people with this job could be pulling in 15.2% more, or $17,943.

Marketing Manager

The current median base salary is $80,000, while the current market value is $94,107.

The potential salary growth is 15% — that’s $14,107.

Program Manager

With a current median base salary of $88,000, the current market value is actually $103,302.

The potential salary growth is 14.8%, or $15,302.

UX Designer

The current median base salary is $86,000, but the current market value comes in at $100,875.

The potential salary growth is 14.7% — that’s $14,875.

Consultant

With a current median base salary of $85,000, the current market value is $99,462.

But consultants could actually be making 14.5% more, or $14,462.

Tax Manager

The current median base salary is $107,019 and the current market value is $124,349.

Tax managers could be making 13.9% more, or $17,330.

Data Scientist

The current median base salary is $100,000, and the current market value is $115,752.

Data scientists could actually be earning 13.6% more, or $15,752.

Systems Engineer

With a current median base salary of $87,000, the current market value is actually $100,634.

This job has 13.5% in potential salary growth, meaning that systems engineers could be earning $13,634 more.

Network Engineer

The current median base salary for this job is $80,000, but the current market value is $92,508.

With a potential salary growth of 13.5%, network engineers could be making $12,508 more.

Product Manager

With a current median base salary of $108,000, the current market value is actually $124,874.